Quick-releasing valve for air-brakes.



No. 661,574. Patented Nov. I3, |900. P. H. Coleman.V

l QUICK RELEASING VALVE FUR AIR'BRAKES.

(Application led Aug. 7, 1900.)

- ff/W 45W' nu: Nnals versus co. wnmumo., wAsmNafou, n. c.

NITED STATES PERRY HUGHES OORBETT,

PATENT OFFICE.

OF HANNIBAL, MISSOURI.

SPECIFICATION forming part of Letters Patent No. 661,574, dated November13, 1900. Applicationrled August '7, 1900. Serial No. 26,196. (Nomodel.)

To all wiz/0m t may concern:

Be it known that I, PERRY HUGHES Coe BETT, a citizen ofthe UnitedStates, residing at Hannibal, in the county of Marion and State ofMissouri, have invented certain new and useful Improvements inQuick-Releasing` Valves for Air-Brakes; and I do hereby de-` clare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it.

appertains to make and use the same.

This invention relates to an improvement in quick-releasing valves forair-brakes.

The object of the invention is to utilize the expansion of the airpassed through the valve to the brake-cylinder to operate the valve andexhaust the air from the brake-cylinder when the pressure is reduced inthe pipe leading to said valve.

With this and other objects in view the invention consists of certainnovel features of construction and arrangement of parts hereinafterdescribed, and pointed out in the claims.

Referring to the drawings, Figure 1 is a longitudinal sectional view ofthe valve, showing the exhaust-passage open and the cut-out valveclosed. Fig. 2 is a like view showing the exhaust-passage closed and thecut-out valve open.

1 indicates a pipe by which communication is effected from the triplevalve (not shown) to the release-valvethrough the inlet-passage 2, saidpassage preferably consisting of an exteriorly and interiorly threadedbushing 3, mounted in the casinga. After the airpasses through theinlet-passage 2 it enters a pistonoperating chamber 5, which has mountedtherein a hollow cylindrical piston 6, closed at one end and having itsWall provided with air-ports, the preferred form being in providing theexterior face of the wall of the piston with two annular grooves 7 and8, and communicating with each of said grooves from the interior of thepiston is a series of holes 9 and 10.

Attached to the piston 6 is an exhaust opening and closing member 11 foropening and closing the exhaust-passage 12, said member 11 consisting,preferably, of a cylindrical eX- tension to the closed end of the piston6, but being smaller in diameter than said piston to form animpact-shoulder 13 and having its free end beveled at 14 to seat itselfon like side walls 15 of the exhaust-opening 12l As the air enters thepiston-operating chamber it moves forward the piston, thus closing theair-exhaust passage and registering the annular groove 7 with anair-passage 16, communicating with a brake-cylinder-operating chamber17, said passage 17 being normally closed by a valve 18. The preferredform of valve is shown, consisting of a valve-plate 19, having anupwardly-extending stem 20, and which projects into a hollow stem of aremovable plug 21 in the wall of the casing 1, so that should the valveget out of order it may be taken out and repaired. Between the insideface of the plug 21 and the upper face of the valve-plate 19 is secureda spiral spring 22 for holding the valve normally closed and is openedonly when the annular groove 7 registers with the air-passage 16,through which the air'then passes and by way of thebrake-cylinder-operating chamber and the pipe 23 to the brake cylinder.(Not shown.)

` To release the brake, the pressure is reduced in the pipe 1 in theusual way, and the air under pressure in the brake-cylinder-operatingchamber, pipe 23, and brake-cylinder will enter the exhaust-ch`ainber 24through the passage 25.

The exhaust-chamber is separated from the piston operating chamber by anannular flange 26, which surrounds the exhaust opening and closingmember 11 and is provided with air-ports 27, communicating with thepiston-operating chamber at the other side of the piston. From theexhaust-air chamber some of the air passes through the air-ports 27, andthe pressure on the impact-shoulder 13 forces the piston back to itsinitial position, thus operating the exhaust opening and closing memberand releasing the air through the exhaust-passage.

Should it be desiredV to cut out the device, a cut-out valve 28, havingair-ports 29, is provided. Said valve when open communicates directlyfrom the piston-operating chamber by way of the air-port. 10 and theannular grooves S to the brake-cylinder-operating chamber.

The operation of the device may be con- IOO

